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  • Extract value for given time latitude and longitude · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
251057046 https://github.com/pydata/xarray/issues/1025#issuecomment-251057046 https://api.github.com/repos/pydata/xarray/issues/1025 MDEyOklzc3VlQ29tbWVudDI1MTA1NzA0Ng== fmaussion 10050469 2016-10-03T08:54:41Z 2016-10-03T08:54:41Z MEMBER

Glad that it worked out for you. Maybe you can close this issue?

 
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   Extract value for given time latitude and longitude 180503054
251045880 https://github.com/pydata/xarray/issues/1025#issuecomment-251045880 https://api.github.com/repos/pydata/xarray/issues/1025 MDEyOklzc3VlQ29tbWVudDI1MTA0NTg4MA== slharris 12929592 2016-10-03T07:48:53Z 2016-10-03T07:48:53Z NONE

Brilliant - thank you!

 
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   Extract value for given time latitude and longitude 180503054
251042556 https://github.com/pydata/xarray/issues/1025#issuecomment-251042556 https://api.github.com/repos/pydata/xarray/issues/1025 MDEyOklzc3VlQ29tbWVudDI1MTA0MjU1Ng== fmaussion 10050469 2016-10-03T07:25:30Z 2016-10-03T07:25:30Z MEMBER

Without knowing how your data looks like it's difficult to say, but maybe you are getting a KeyError because of floating point precision issues. Maybe the keyword method='nearest' will be useful to you?

See the doc for other examples: http://xarray.pydata.org/en/stable/indexing.html#nearest-neighbor-lookups

 
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   Extract value for given time latitude and longitude 180503054
251040498 https://github.com/pydata/xarray/issues/1025#issuecomment-251040498 https://api.github.com/repos/pydata/xarray/issues/1025 MDEyOklzc3VlQ29tbWVudDI1MTA0MDQ5OA== slharris 12929592 2016-10-03T07:08:48Z 2016-10-03T07:08:48Z NONE

Thanks for your response. I am not wanting a range of values that is why I don't want to use slice - I just want the value at the given time, latitude and longitude.

If I use .isel() I receive an 'Assertion Error' on this line: MaxTempatpoint=MaxTempattime.isel(latitude=-39.14952469, longitude=140.84791565)

and if I use .sel() I receive a 'Key Error' - KeyError: -39.14952469 on this line: MaxTempatpoint=MaxTempattime.sel(latitude=-39.14952469, longitude=140.84791565)

I haven't pasted entire error message because I am assuming the issue I am having is simple??

Should I some how convert the latitude and longitude to a different data type and then access? Or is there some way of accessing an index for the latitude and longitude? Any feedback will be greatly appreciated. 

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   Extract value for given time latitude and longitude 180503054
250962829 https://github.com/pydata/xarray/issues/1025#issuecomment-250962829 https://api.github.com/repos/pydata/xarray/issues/1025 MDEyOklzc3VlQ29tbWVudDI1MDk2MjgyOQ== fmaussion 10050469 2016-10-02T09:41:41Z 2016-10-02T09:41:41Z MEMBER

Hi @slharris ,

Note that .isel() is for integer indexing while .sel() is for indexing by value (probably what you want).

if you want a range of values you should give a slice as argument, as indicated in the documentation: e.g. .sel(longitude=slice(34, 67))

(PS: when you report a problem it would be useful to also post the error message, which is more informative than "#this is where the problem occurs")

 
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   Extract value for given time latitude and longitude 180503054

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